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Windows 7: intermittent sluggishness/lots of errors

A computer in my small P2P network of six 2010 computers that all run Win 7 Pro has been behaving sluggishly for the past couple of weeks. The user says that some days it seems fine but other days it takes forever to do a simple task.

With the user out of the office for a couple of days, yesterday I began trying to diagnose the problem. I have noticed and experienced the following:

1) The first time I tried to boot the computer, it got caught in a boot loop and froze on the black Windows screen that says “Starting Windows”. I had to do a hard shut down to break the freeze.

I booted into Safe Mode and followed the recommended action to run “Startup Repair”, which was unsuccessful in fixing the problem.

I did a System Restore to the ONLY restore point, which was 3/24. This enabled me to boot the computer normally.

2) Once the computer had booted normally, I noticed that when I booted MalwareBytes (free version), it was unable to connect to the internet to update its definitions. Firefox (the default browser) also cannot connect to the internet, although Internet Explorer can. MalwareBytes found no threats in its scan.

3) Our default firewall/AV is Norton 360, and it is not running. Nor can I get it to boot (I get an “unspecified error” when attempting to boot).

4) Reviewing the System Log in Event Viewer, I have found in the past month increasingly frequent errors, one of which was critical (system reboot w/o clean shutdown). The most frequent errors are:

Norton is now running again, and Firefox is connecting to the internet. I'll keep my eye on the System Log to see if the errors continue (seems to be OK at the moment), and I've asked the user to keep me apprised if there are further performance issues.

intermittent sluggishness/lots of errors

BSOD after cold boot, lots of different errorsList of some of the errors that I can list off the top of my head:
memory_management
SYSTEM_SERVICE_EXCEPTION
The minidump logs aren't saving either, even after I configured them to in the Control Panel, which is weird. I hope I can get this fixed.

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BSOD with lots of different errors.My laptop is BSOD'ing at random times and seems to throw up different reasons.
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My laptop is an Acer Aspire 5750 Running windows 7 64bit.
Any help would be greatly appreciated.

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